C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 5/58 (2006.01) C08J 9/04 (2006.01) C08K 5/57 (2006.01) C08L 27/06 (2006.01)
Patent
CA 2213664
Improved activation of the blowing agent used to form blown PVC products, as well as thermal stabilization, are provided by a combination of an ester of the formula (R1)t-2Sn(-S-R a-OC(=O)R2)2-3 wherein R1 is C1-4 alkyl, R a is alkyl, and R2 is C6-24a alkyl or alkenyl; one or both of mono (C1-4 alkyl) and di (C1-4 alkyl) tin sulfides; a complex of diorganotin oxide with an oxygen-containing acid; and optionally an ester HS-R c-OC(=O)R3 wherein R c is alkyl and R3 is C6-24 alkyl or alkenyl.
L'invention concerne un procédé qui consiste à améliorer l'activation des agents gonflants utilisés pour la fabrication de produits en PVC expansé, de même que la stabilisation thermique de ceux-ci, au moyen d'une combinaison d'ester correspondant à la formule: (R<1>)1-2Sn(-S-R<a>-OC(=O)R<2>)2-3 dans laquelle, R<1> est alkyle C1-4, R<a> est alkyle et R<2> est alkyle ou alcényle C6-24. Le système d'activation comprend en outre un sulfure stanneux mono(alkyle C1-4) et di(alkyle C1-4) ou les deux à la fois; un complexe d'oxyde di-organo-étain et d'acide oxygéné, et éventuellement un ester HS-R<c>-OC(=O)R<3> où R<c> est alkyle et R<3> est alkyle ou alcényle C6-24.
Mcfadden Fincham
Witco Corporation
LandOfFree
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